Adapter, extension, and connector assemblies for surgical devices

ABSTRACT

An assembly including an adapter assembly and an extension assembly for connecting an end effector to an electrosurgical instrument is provided. The adapter assembly includes a first pusher assembly configured for converting rotational motion into linear motion. The first pusher assembly includes a pusher member and first and second pawl assemblies for operable engagement with a flexible band assembly of the extension assembly.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the benefit of and priority to U.S. Provisional Patent Application No. 62/251,930, filed Nov. 6, 2015, the entire disclosure of which is incorporated by reference herein.

BACKGROUND

1. Technical Field

The present disclosure relates generally to powered surgical devices. More specifically, the present disclosure relates to an adapter assembly for selectively connecting an extension assembly including an end effector to the actuation units of the powered surgical devices.

2. Background of Related Art

Powered devices for use in surgical procedures are known. To permit reuse of the handle assemblies of these powered surgical devices and so that the handle assembly may be used with a variety of end effectors, adapter assemblies and extension assemblies have been developed for selective attachment to the handle assemblies and to a variety of end effectors. Following use, the adapter and/or extension assemblies may be disposed of along with the end effector. In some instances, the adapter assemblies and extension assemblies may be sterilized for reuse.

SUMMARY

A surgical assembly for operably connecting an end effector to an electrosurgical instrument is provided. The surgical assembly includes an adapter assembly including a connector assembly, a drive transfer assembly operably received through the connector assembly and including a first rotatable shaft, and a first pusher assembly operably connected to the first rotatable shaft for converting rotational motion from the first rotatable shaft to longitudinal movement to perform a first function, the first pusher assembly including a first pusher member and first and second pawl assemblies. The surgical assembly further includes an extension assembly operably connected to a distal end of the adapter assembly. The extension assembly includes a flexible band assembly operably connectable to the first and second pawl assemblies of the first pusher assembly.

In embodiments, the surgical assembly further includes a second pusher assembly, and a second rotatable shaft operably connected to the second pusher assembly for converting rotational motion from the second rotatable shaft to longitudinal movement to perform a second function. The surgical assembly may further include a drive member, and a third rotatable shaft operably connected to the drive assembly for transferring rotational motion from the third rotatable shaft to perform a third function. The first pawl assembly may include a first plurality of pawl members, and the second pawl assembly includes a second plurality of pawl members. The flexible band assembly may include first and second connector members. Each of the first and second connector members may define an opening configured for selective receipt of a respective one of the first and second pawl assemblies.

In some embodiments, the first plurality of pawl members includes a protrusion selectively receivable within the opening of the first connector member, and the second plurality of pawl members includes a protrusion selectively receivable within the opening of the second connector member. Each of the protrusions may include a flat proximal facing surface and a slanted distal facing surface. The first and second plurality of pawl members may be pivotally secured to the pusher member.

The pusher member may include a first retainer for supporting the first plurality of pawl members, and a second retainer for supporting the second plurality of pawl members. The first and second retainers may each define a longitudinal slot for receiving the respective first and second plurality of pawl members. The first plurality of pawl members may be pivotally received within the longitudinal slot of the first retainer, and the second plurality of pawl members may be pivotally received within the longitudinal slot of the second retainer. Each of the first and second plurality of pawl members may be configured to flex radially inward. The first and second plurality of pawl members may each include a curved profile. The first and second plurality of pawl members may each be formed of a resilient material.

BRIEF DESCRIPTION OF THE DRAWINGS

Embodiments of the present disclosure are described herein with reference to the accompanying drawings, wherein:

FIG. 1 is a perspective separated view of an adapter assembly, in accordance with an embodiment of the present disclosure, an extension assembly, in accordance with an embodiment of the present disclosure, and an exemplary electromechanical surgical device;

FIG. 2 is a perspective side view of the exemplary electromechanical surgical device of FIG. 1;

FIG. 3 is a perspective side view of the adapter assembly of FIG. 1;

FIG. 4 is a perspective side view of the adapter assembly of FIG. 3 with the outer sleeve removed;

FIG. 5 is a perspective side view of the adapter assembly of FIGS. 3 and 4 with proximal and distal housings of first and second pusher assemblies removed;

FIG. 6 is a cross-sectional side view of the adapter assembly of FIGS. 2-4 taken along line 6-6 in FIG. 3;

FIG. 7 is a cross-sectional side view of the adapter assembly of FIGS. 2-5 taken along line 7-7 in FIG. 5;

FIG. 8 is an enlarged, perspective view of a coupling assembly and a transfer assembly of the adapter assembly of FIGS. 2-7;

FIG. 9 is a perspective side view of adapter assembly of FIGS. 2-7 with the housing assemblies removed;

FIG. 10 is an enlarged view of the indicated area of detail of FIG. 9;

FIG. 11 is an enlarged view of the indicated area of detail of FIG. 6;

FIG. 12 is an enlarged view of the indicated area of detail of FIG. 7;

FIG. 13 is a perspective end view of the transfer assembly of FIG. 8;

FIG. 14 is an enlarged view of the indicated area of detail of FIG. 6;

FIG. 15 is an enlarged view of the indicated area of detail of FIG. 7;

FIG. 16 is an enlarged view of the indicated area of detail of FIG. 9;

FIG. 17 is a perspective side view of the extension assembly of FIG. 1;

FIG. 18 is a perspective side view of an inner flexible band assembly of the extension assembly of FIG. 17;

FIG. 19 is a perspective side view of an outer flexible band assembly of the extension assembly of FIG. 17;

FIG. 20 is a perspective side view of the inner and outer flexible band assemblies of FIGS. 18 and 19 and an exploded view of a frame assembly of the extension assembly of FIG. 17;

FIG. 21 is a perspective side view of the inner and outer flexible band assemblies and frame assembly of FIG. 20;

FIG. 22 is an enlarged view of the indicated area of detail of FIG. 21;

FIG. 23 is a front, perspective view of the inner and outer flexible band assemblies and frame assembly of FIG. 20;

FIG. 24 is an enlarged view of the indicated area of detail of FIG. 23;

FIG. 25 is a cross-sectional end view taken along line 25-25 of FIG. 17;

FIG. 26 is a cross-sectional end view taken along line 26-26 of FIG. 17;

FIG. 27 is an enlarged perspective side view of a distal end of the inner and outer flexible band assemblies and frame assembly of FIG. 20 including a proximal seal member and first and second distal seal members;

FIG. 28 is an exploded perspective view of the proximal seal member and first and second distal seal members of FIG. 27;

FIG. 29 is an exploded view of a trocar assembly of the extension assembly of FIG. 17;

FIG. 29A is a perspective side view of a connector assembly of the extension assembly of FIG. 17;

FIG. 29B is a cross-section side view of the connector assembly of FIG. 29A;

FIG. 30 is a perspective side view of the trocar assembly of FIG. 29;

FIG. 31 is a cross-sectional side view taken along line 31-31 of FIG. 30;

FIG. 32 is a cross-sectional top view taken along line 32-32 of FIG. 17;

FIG. 33 is an enlarge cross-sectional view of the distal end of the extension assembly of FIG. 17;

FIG. 34 is a perspective side view of the adapter assembly of FIG. 3 connected to the extension assembly of FIG. 17 and an end effector and an anvil assembly connected to the extension assembly;

FIG. 35A is an enlarged cross-sectional top view of the indicated area of detail of FIG. 34;

FIG. 35B is an enlarged cross-sectional side view of the indicated area of detail in FIG. 34;

FIG. 36 is a perspective side view of an adapter assembly according to another embodiment of the present disclosure;

FIG. 37 is a cross-sectional side view taken along line 37-37 of FIG. 36;

FIG. 38 is an enlarged cross-sectional side view of the indicated area of detail of FIG. 37;

FIG. 39 is an exploded perspective view of a pusher assembly of the adapter assembly of FIG. 36;

FIG. 40 is a perspective side view of the pusher assembly of FIG. 39;

FIG. 41 is a cross-sectional side view taken along line 41-41 of FIG. 40;

FIG. 42 is a cross-sectional top view of the adapter assembly of FIG. 36 secured to the extension assembly of FIG. 17;

FIG. 43 is an enlarged cross-sectional top view of the indicated area of detail of FIG. 42, prior to full securement of the extension assembly to the adapter assembly;

FIG. 44 is an enlarged cross-sectional top view of the indicated area of detail of FIG. 42, with the extension assembly secured to the adapter assembly; and

FIG. 45 is a perspective side view of the adapter assembly and extension assembly of FIG. 42, with outer sleeves removed.

DETAILED DESCRIPTION OF EMBODIMENTS

Embodiments of the presently disclosed adapter assemblies and extension assemblies for surgical devices and/or handle assemblies are described in detail with reference to the drawings, in which like reference numerals designate identical or corresponding elements in each of the several views. As used herein the term “distal” refers to that portion of the adapter assembly or surgical device, or component thereof, farther from the user, while the term “proximal” refers to that portion of the adapter assembly or surgical device, or component thereof, closer to the user.

With reference to FIG. 1, an adapter assembly in accordance with an embodiment of the present disclosure, shown generally as adapter assembly 100, is configured for selective connection to a powered handheld electromechanical instrument shown, generally as surgical device 10. As illustrated in FIG. 1, the surgical device 10 is configured for selective connection with the adapter assembly 100, and, in turn, the adapter assembly 100 is configured for selective connection with an extension assembly 200. The extension assembly 200 is configured for selective connection with a tool assembly or end effector, e.g. tool assembly 30 (FIG. 34), including a loading unit, e.g. loading unit 40 (FIG. 34), and an anvil assembly, e.g., anvil assembly 50 (FIG. 34), for applying a circular array of staples (not shown) to tissue (not shown).

As illustrated in FIGS. 1 and 2, the surgical device 10 includes a handle housing 12 having a lower housing portion 14, an intermediate housing portion 16 extending from and/or supported on the lower housing portion 14, and an upper housing portion 18 extending from and/or supported on the intermediate housing portion 16. A distal half-section of the upper housing portion 18 defines a nose or connecting portion 18 a configured to accept a corresponding drive coupling assembly 110 (FIG. 10) of the adapter assembly 100. For a detailed description of the structure and function of an exemplary electromechanical instrument, please refer to commonly owned U.S. Pat. Appl. Publ. No. 2012/0253329 (“the '329 application”), the contents of which is incorporated by reference herein in its entirety.

The adapter assembly 100 will now be described with reference to FIGS. 3-20. Referring initially to FIG. 3, the adapter assembly 100 includes a proximal end 102 configured for operable connection to the connecting portion 18 a (FIG. 1) of the surgical device 10 (FIG. 1) and a distal end 104 configured for operable connection to the extension assembly 200 (FIG. 1).

Turning to FIGS. 3-5, from the proximal end 102 to the distal end 104 of the adapter assembly 100, the adapter assembly 100 includes a drive coupling assembly 110, a drive transfer assembly 130 operably connected to the drive coupling assembly 110, a first pusher assembly 160 operably connected to the drive transfer assembly 130, and a second pusher assembly 180 operably connected to the drive transfer assembly 130. Each of the drive transfer assembly 130 and the first and second pusher assemblies 160, 180 are operably maintained within an outer sleeve 106 (FIG. 3). As will be described in further detail below, a shaft 108 (FIG. 3) extends longitudinally through the adapter assembly 100 and is operably connected to the drive transfer assembly 130.

With reference to FIGS. 5-9, the drive coupling assembly 110 has a cylindrical profile and is configured to selectively secure the adapter assembly 100 to the surgical device 10 (FIG. 1). The drive coupling assembly 110 includes a connector housing 112 and a connector extension 114 fixedly connected to the connector housing 112 by a mounting plate 113. The connector housing 112 and the connector extension 114 operate to rotatably support a first rotatable proximal drive shaft 116, a second rotatable proximal drive shaft 118, and a third rotatable proximal drive shaft 120. The connector housing 112 and the connector extension 114 of the drive coupling assembly 110 also rotatably support the first, second, and third connector sleeves 116, 118, and 120, respectively. Each of the connector sleeves 122, 124, 126 is configured to mate with the respective first, second, and third drive connectors (not shown) of surgical device 10 (FIG. 1). Each of the connector sleeves 122, 124, 126 is further configured to mate with a proximal end 116 a, 118 a, 120 a of the respective first, second and third proximal drive shafts 116, 118, 120.

The drive coupling assembly 110 also includes first, second and third biasing members 122 a, 124 a and 126 a disposed distally of the respective first, second and third connector sleeves 122, 124, 126. Each of the biasing members 122 a, 124 a and 126 a is disposed about the respective first, second, and third rotatable proximal drive shafts 116, 118 and 120 to help maintain the connector sleeves 122, 124, and 126 engaged with the distal end of the respective rotatable drive connectors (not shown) of the surgical device 10 when the adapter assembly 100 is connected to the surgical device 10. In particular, the first, second, and third biasing members 122 a, 124 a, and 126 a function to bias the respective connector sleeves 122, 124, and 126 in a proximal direction.

For a detailed description of an exemplary drive coupling assembly, please refer to the '329 application, the contents of which were previously incorporated by reference herein.

With reference to FIGS. 9-13, the drive transfer assembly 130 has a cylindrical profile and operably connects the distal ends of the first, second, and third rotatable proximal drive shafts 116, 118, and 120 to the shaft 108, the first pusher assembly 160, and the second pusher assembly 180, respectively. The drive transfer assembly 130 includes a support plate 132 (FIGS. 11 and 12) secured to a proximal end of the connector housing 112 and a drive transfer housing 134 positioned adjacent the support plate 132. The support plate 132 and the housing 134 operate to rotatably support a first rotatable distal drive shaft 136, a second rotatable distal drive shaft 138 and a drive member 140.

The first and second rotatable distal drive shafts 136 and 138 are each operably connected to the respective first and second rotatable proximal drive shafts 116 and 118 of the drive coupling assembly 110 by a pair of gears. In particular, the distal ends of each of the first and second rotatable proximal drive shaft 116 and 118 include a geared portion 142 a and 144 a, respectively, which engages a proximal drive gear 142 b and 144 b on a proximal end of the respective first and second distal drive shafts 136 and 138. As shown, each of the respective paired geared portions and proximal drive gears 142 a, 142 b and 144 a, 144 b are the same size to provide a 1:1 gear ratio between the respective first and second rotatable proximal and distal drive shafts 116, 136 and 118, 138. In this manner, the respective first and second rotatable proximal and distal drive shafts 116, 136 and 118, 138 rotate at the same speed. However, it is envisioned that either or both of the paired geared portions and proximal drive gears may be of different sizes to alter the gear ratio between the first and second rotatable proximal and distal drive shafts 116, 136 and 118, 138.

A distal end of the third proximal drive shaft 120 of the drive coupling assembly 110 includes a geared portion 146 a that engages a geared portion 146 b formed on a proximal end of the drive member 140 of the drive transfer assembly 130. The size of the geared portion 146 a on the third proximal drive shaft 120 and the geared portion 146 b on the drive member 140 are the same size to provide a 1:1 gear ratio between the third proximal drive shaft 120 and the drive member 140. In this manner, the third proximal drive shaft 120 and the drive member 140 rotate at the same speed. However, it is envisioned that either or both of the geared portions 146 a, 146 b may be of different sizes to alter the gear ratio between the third proximal drive shaft 120 and the drive member 140. A distal end of the drive member 140 defines a socket 145 that receives a proximal end 108 a of the shaft 108. Alternatively, the socket 145 may be configured to operably engage a proximal end 208 a of a drive shaft (FIG. 17) of an extension assembly 200 (FIG. 17).

The drive transfer assembly 130 also includes a drive connector 148 (FIG. 11) operably connecting the first rotatable distal drive shaft 136 to the first pusher assembly 160 and a tubular connector 150 operably connecting the second rotatable distal drive shaft 138 to the second pusher assembly 180. In particular, a distal end of the first rotatable distal drive shaft 136 includes a geared portion 152 a that engages a geared portion 152 b of the drive connector 148. A distal end of the second rotatable distal drive shaft 138 includes a geared portion 154 a that engages a drive gear 154 b secured to a distal end of the tubular connector 150.

As shown, the geared portion 152 a of the first rotatable distal drive shaft 136 is smaller than the geared portion 152 b of the drive connector 148 to provide a gear ratio of greater than 1:1 between the first rotatable distal drive shaft 136 and the drive connector 148. In this manner, the drive connector 148 rotates at a slower speed than the first rotatable distal drive shaft 136. Similarly, the geared portion 154 a of the second rotatable distal drive shaft 138 is smaller than the drive gear 154 b on the tubular connector 150 to provide a gear ratio of greater than 1:1 between the second rotatable distal drive shaft 138 and the drive connector 148. In this manner, the tubular connector 150 rotates at a slower speed than the second rotatable distal drive shaft 138. However, it is envisioned that each of the paired geared portions 152 a, 152 b, and the geared portion 154 a and the drive gear 154 b may be the same size to provide a gear ratio of 1:1 between the respective first rotatable distal drive shaft 136 and the drive connector 148 and between the second rotatable distal drive shaft 138 and the tubular connector 150.

With particular reference to FIGS. 9-13, the first pusher assembly 160 includes proximal and distal housing sections 162, 164 (FIG. 11), a planetary gear assembly 166 operably mounted within the proximal housing section 162, a screw member 168 (FIG. 11) operably connected to the planetary gear assembly 166 and rotatably supported within the distal housing section 164, and a pusher member 170 (FIG. 11) operably connected to the screw member 168 and slidably disposed within the distal housing section 164. The proximal housing section 162 includes a pair of longitudinal flanges 162 a (FIG. 4; only one shown) and the distal housing section 164 includes a pair of longitudinally flattened portions 164 a. Each of the flanges 162 a and the flattened portions 164 a of the respective proximal and distal housing sections 162, 164 engage an inner surface of the sleeve 106 to prevent rotation of the respective proximal housing section 162 and the distal housing section 164 relative to the sleeve 106 during operation of the surgical device 10.

The planetary gear assembly 166 includes first and second planetary gear systems 166 a, 166 b (FIG. 10). The first planetary gear system 166 a of the first pusher assembly 160 includes a central drive gear 172 a mounted on a distal end of the drive connector 148 of the drive transfer assembly 130 and a plurality of planetary gears 174 a rotatably mounted to a rotatable support ring 176.

Each of the planetary gears 174 a engages the central drive gear 172 a and a toothed inner surface 165 of the proximal housing section 162. As central drive gear 172 a rotates in a first direction, i.e., clockwise, each of the planetary gears 174 a rotates in a second direction, i.e., counter-clockwise. As each of the planetary gears 174 a rotates in the second direction, engagement of the planetary gears 174 a with the toothed inner surface 165 of the distal housing section 162 causes the rotatable support ring 176 to rotate in the first direction. Conversely, rotation of the central drive gear 172 a in the second direction causes rotation of each of the planetary gears 174 a in the first direction thereby causing rotation of the rotatable support ring 176 in the second direction. The configuration of the first planetary gear system 166 a provides a reduction in the gear ratio. In this manner, the speed of rotation of the rotatable support ring 174 is less than the speed of rotation of the central drive gear 172 a.

The second planetary gear system 166 b of the first pusher assembly 160 includes a central drive gear 172 b securely affixed to the rotatable support ring 176 and a plurality of planetary gears 174 b rotatably mounted to a proximal end surface 168 a of the screw member 168. Each of the planetary gears 174 b engages the central drive gear 172 b and the toothed inner surface 165 of the proximal housing section 162. As the rotatable support ring 176 of the first planetary gear system 166 a rotates in the first direction thereby causing the central drive gear 172 b to also rotate in the first direction, each of the planetary gears 174 b rotates in the second direction. As each of the planetary gears 174 b rotates in the second direction, engagement of the planetary gears 174 b with the toothed inner surface 165 of the proximal housing section 162 causes the screw member 168 to rotate in the first direction. Conversely, rotation of the central drive gear 172 b in the second direction causes rotation of each of the planetary gears 174 b in the first direction, thereby causing the screw member 168 to rotate in the second direction. The configuration of the second planetary gear system 166 b provides a reduction in the gear ratio. In this manner, the speed of rotation of the screw member 168 is less than the speed of rotation of the central drive gear 172 b.

The first and second planetary gear systems 166 a, 166 b operate in unison to provide a reduction in the gear ratio between the first rotatable proximal drive shaft 116 and the screw member 168. In this manner, the reduction in the speed of rotation of the screw member 168 relative to the drive connector 148 is a product of the reduction provided by the first and second planetary gear systems 166 a, 166 b.

The screw member 168 is rotatably supported within the proximal housing portion 162 and includes a threaded distal end 168 b that operably engages a threaded inner surface 170 a of the pusher member 170. As the screw member 168 is rotated in the first direction, engagement of the threaded distal end 168 b of the screw member 168 with the threaded inner surface 170 a of the pusher member 170 causes longitudinal advancement of the pusher member 170, as indicated by arrows “A” in FIG. 12. Conversely, rotation of the screw member 168 in the second direction causes retraction of the pusher member 170.

The pusher member 170 includes a pair of tabs 178 formed on a distal end thereof for engaging the connector extensions 240, 242 (FIG. 19) of the outer flexible band assembly 230 (FIG. 19) of the extension assembly 200 (FIG. 17). Although shown as tabs 178, it is envisioned that the pusher member 170 may include any structure suitable for selectively engaging the connector extensions 240, 242 of the outer flexible band 230 of the extension assembly 200.

With particular reference now to FIGS. 14-16, the second pusher assembly 180 is substantially similar to the first pusher assembly 160, and includes proximal and distal housing sections 182, 184, a planetary gear assembly 186 operably mounted within the proximal housing section 182, a screw member 188 operably connected to the planetary gear assembly 186 and rotatably supported within the distal housing section 184, and a pusher member 190 operably connected to the screw member 188 and slidably disposed within the distal housing section 184. Each of the proximal housing section 182 and the distal housing section 184 includes a pair of longitudinal flanges 182 a, 184 a (FIG. 4; only one shown), respectively, engaging an inner surface of the sleeve 106 of the adapter assembly 100 to prevent rotation of the respective proximal housing section 182 and the distal housing section 184 relative to the sleeve 106 during operation of the surgical device 10.

The planetary gear assembly 186 includes first and second planetary gear systems 186 a, 186 b (FIG. 16). The first planetary gear system 186 a of the second pusher assembly 180 includes a central drive gear 192 a mounted on a distal end of the tubular connector 150 of the drive transfer assembly 130 and a plurality of planetary gears 194 a rotatably mounted to a rotatable support ring 196.

Each of the planetary gears 194 a engages the central drive gear 192 a and a toothed inner surface 185 of the proximal housing section 182. As central drive gear 192 a rotates in a first direction, i.e., clockwise, each of the planetary gears 194 a rotates in a second direction, i.e., counter-clockwise. As each of the planetary gears 194 a rotates in the second direction, engagement of the planetary gears 194 a with toothed inner surface 185 of the distal housing section 182 causes the rotatable support ring 196 to rotate in the first direction. Conversely, rotation of the central drive gear 192 a in the second direction causes rotation of each of the planetary gears 194 a in the first direction thereby causing rotation of the rotatable support ring 196 in the second direction. The configuration of the first planetary gear system 186 a provides a reduction in the gear ratio. In this manner, the speed of rotation of the rotatable support ring 194 is less than the speed of rotation of the central drive gear 190 a.

The second planetary gear system 186 b of the second pusher assembly 180 includes a central drive gear 192 b securely affixed to the rotatable support ring 196 and a plurality of planetary gears 194 b rotatably mounted to a proximal end surface 188 a of the screw member 188. Each of the planetary gears 194 b engages the central drive gear 192 b and the toothed inner surface 185 of the proximal housing section 182. As the rotatable support ring 196 of the first planetary gear system 186 a rotates in the first direction thereby causing the central drive gear 192 b to also rotate in the first direction, each of the planetary gears 174 b rotates in the second direction. As each of the planetary gears 194 b rotates in the second direction, engagement of the planetary gears 194 b with the toothed inner surface 185 of the proximal housing section 182 causes the screw member 188 to rotate in the first direction. Conversely, rotation of the central drive gear 192 b in the second direction causes rotation of each of the planetary gears 194 b in the first direction, thereby causing the screw member 198 to rotate in the second direction. The configuration of the second planetary gear system 186 b provides a reduction in the gear ratio. In this manner, the speed of rotation of the screw member 188 is less than the speed of rotation of the central drive gear 182 b. The first and second planetary gear systems 186 a, 186 b operate in unison to provide a reduction in the gear ratio between the second rotatable proximal drive shaft 118 and the screw member 188. In this manner, the reduction in the speed of rotation of the screw member 188 relative to the tubular connector 150 is a product of the reduction provided by the first and second planetary gear systems 186 a, 186 b.

The screw member 188 is rotatably supported within the proximal housing portion 182 and includes a threaded distal end 188 b that operably engages a threaded inner surface 190 a of the pusher member 190. As the screw member 188 is rotated in the first direction, engagement of the threaded distal end 188 b of the screw member 188 with the threaded inner surface 190 a of the pusher member 190 causes longitudinal advancement of the pusher member 190. Conversely, rotation of the screw member 188 in the second direction causes retraction of the pusher member 190. The pusher member 190 includes a pair of longitudinal flanges 191 (FIG. 5; only one shown) that engage the distal housing section 184 of the second pusher assembly 180 for preventing rotation of the pusher member 190 relative to the distal housing section 184.

The pusher member 190 includes a pair of tabs 198 formed on a distal end thereof for engaging the connector extensions 220, 224 (FIG. 18) of the inner flexible band assembly 220 (FIG. 18) of the extension assembly 200 (FIG. 17). Although shown as tabs 198, it is envisioned that the pusher member 190 may include any structure suitable for selectively engaging the connector extensions 240, 242 of the outer flexible band 230 of the extension assembly 200.

The extension assembly 200 for operably connecting the adapter assembly 100 (FIG. 3) with a circular loading unit, e.g. the loading unit 40 (FIG. 34) and an anvil assembly, e.g., the anvil assembly 50 (FIG. 34) will be described with reference now to FIGS. 17-34. In particular, a proximal end 202 of the extension assembly 200 operably connects with the distal end 104 (FIG. 3) of the adapter assembly 100 (FIG. 3) and a distal end 204 of the extension assembly 200 operably connects with the loading unit 40 and the anvil assembly 50. As shown, the extension assembly 200 provides a slight curvature between the proximal and distal ends 202, 204. In an alternative embodiment, the extension assembly 200 may be straight or may include a greater curvature. Although the extension assembly 200 will be shown and described as being used to connect the loading unit 40 and the anvil assembly 50 to the adapter assembly 100 (FIG. 3), it is envisioned that the aspects of the present disclosure may be modified for use with various loading units, anvil assemblies, and adapter assemblies. Exemplary loading units and anvil assemblies are described in commonly owned U.S. Pat. No. 8,590,763 and U.S. patent application Ser. Nos. 14/056,301 and 14/149,355, the contents of each being incorporated herein by reference in their entirety.

The extension assembly 200 includes an inner flexible band assembly 210 (FIG. 18), an outer flexible band assembly 230 (FIG. 19) slidably disposed about the inner flexible band assembly 210, a frame assembly 250 (FIG. 20) for supporting the inner and outer flexible band assemblies 210, 230, a trocar assembly 270 (FIG. 28) operably received through the inner and outer flexible band assemblies 210, 230, and a connector assembly 290 for securing the loading unit 40 (FIG. 34) to the extension assembly 200. An outer sleeve 206 (FIG. 17) is received about the frame assembly 250 and the trocar assembly 270 and the inner and outer flexible band assemblies 210, 230 are slidably received through the outer sleeve 206. As will be described in further detail below, the extension assembly 200 may include a drive shaft 208 operably connected to the trocar assembly 270 and extending through the proximal end 202 of the extension assembly 200.

With reference to FIG. 18, the inner flexible band assembly 210 includes first and second inner flexible bands 212, 214, a support ring 216, a support base 218, and first and second connection extensions 220, 222. The proximal ends 212 a, 214 a of the respective first and second inner flexible bands 212, 214 are laterally spaced apart and securely attached to the support ring 216. The distal ends 212 b, 214 b of the first and second inner flexible bands 212, 214 are laterally spaced apart and securely attached to a proximal end 218 a of the support base 218. Each of the first and second inner flexible bands 212, 214 may be attached to the support ring 216 and/or the support base 218 in any suitable manner, including, for example, by press-fitting, welding, adhesives, and/or with mechanical fasteners. As will be described in further detail below, the inner flexible band assembly 210 is configured to be slidably received about the trocar assembly 270 (FIG. 28) and within the outer flexible band assembly 230 (FIG. 19) and the outer sleeve 206 (FIG. 17).

The first and second connection extensions 220, 222 of the inner flexible band assembly 210 extend proximally from the support ring 216 and operably connect the inner flexible band assembly 210 with the pusher member 190 (FIG. 15) of the second pusher assembly 180 (FIG. 15) of the adapter assembly 100 (FIG. 3). In particular, each of the first and second connection extensions 220, 222 define openings 221, 223 configured to receive tabs 198 (FIG. 15) of the pusher member 190 (FIG. 15) of the second pusher assembly 180. Receipt of the tabs 198 of the pusher member 190 within the openings 221, 223 of the respective first and second extensions 220, 222 secure the inner flexible band assembly 210 of the extension assembly 200 with the second pusher assembly 180 of the adapter assembly 100. The first and second connection extensions 220, 222 may be integrally formed with the support ring 216, or attached thereto in any suitable manner.

The support base 218 extends distally from the inner flexible bands 212, 214 and is configured to selectively connect the extension assembly 200 with the loading unit 40 (FIG. 34). Specifically, a distal end 218 a of the support base 218 includes a flange 224 for operable engagement with an axially movable assembly (not shown) of the loading unit 40 (FIG. 34). In one embodiment, the flange 224 is configured for connection with a knife assembly (not shown) of the loading unit 40 (FIG. 34).

With reference now to FIG. 19, the outer flexible band assembly 230 is substantially similar to the inner flexible band assembly 210 and includes first and second flexible bands 232, 234 laterally spaced and connected on proximal ends 232 a, 234 a to a support ring 236 and on distal ends 234 b, 234 b to a proximal end 238 a of a support base 238. Each of the first and second outer flexible bands 232, 234 may be attached to the support ring 236 and the support base 238 in any suitable manner, including, for example, by press-fitting, welding, adhesives, and/or with mechanical fasteners. As will be described in further detail below, the outer flexible band assembly 230 is configured to receive the trocar assembly 270 (FIG. 28) therethrough.

The first and second connection extensions 240, 242 of the outer flexible band assembly 230 extend proximally from the support ring 236 and operably connect the outer flexible band assembly 230 with the pusher member 170 (FIG. 12) of the first pusher assembly 160 (FIG. 12) of the adapter assembly 100 (FIG. 1). In particular, each of the first and second connection extensions 240, 242 define openings 241, 243 configured to receive the tabs 178 (FIG. 12) of the pusher member 170 of the first pusher assembly 180. Receipt of the tabs 178 of the pusher member 170 within the openings 241, 243 of the respective first and second extensions 240, 242 secures the outer flexible band assembly 230 of the extension assembly 200 with the first pusher assembly 180 of the adapter assembly 100. The first and second connection extensions 240, 242 may be integrally formed with the support ring 236, or attached thereto in any suitable manner.

The support base 238 extends distally from the outer flexible bands 232, 234 and is configured to selectively connect the extension assembly 200 with the loading unit 40 (FIG. 34). Specifically, a distal end 238 b of the support base 238 includes a flange 244 for operable engagement with an axially movable assembly (not shown) of a loading unit (not shown). In one embodiment, the flange 244 is configured for connection with a staple pusher assembly (not shown) of the loading unit 40 (FIG. 34).

With reference now to FIGS. 20-26, the frame assembly 250 includes first and second proximal spacer members 252, 254, and first and second distal spacer members 256, 258. When secured together, the first and second proximal spacer members 252, 254 define a pair of inner longitudinal slots 253 a for slidably receiving the first and second flexible bands 212, 214 (FIG. 18) of the inner flexible band assembly 210 (FIG. 18) and a pair of outer longitudinal slots 253 b for slidably receiving the first and second flexible bands 232, 234 (FIG. 19) of the outer flexible band assembly 230 (FIG. 19). The first and second proximal spacer members 252, 254 further define a longitudinal passage 255 for receipt of the trocar assembly 270.

In one embodiment, and as shown, the first and second proximal spacer members 252, 254 are formed of plastic and are secured together with a snap-fit arrangement. Alternatively, the first and second proximal spacer members 252, 254 may be formed of metal or other suitable material and may be secured together in any suitable manner, including by welding, adhesives, and/or using mechanical fasteners.

The first and second distal spacer members 256, 258 define a pair of inner slots 257 a for slidably receiving the first and second flexible bands 212, 214 (FIG. 18) of the inner flexible band assembly 210 (FIG. 18) and a pair of outer slots 257 b for slidably receiving the first and second flexible bands 232, 234 (FIG. 19) of the outer flexible band assembly 230 (FIG. 19). The first and second distal spacer members 256, 258 further define a longitudinal passage 259 for receipt of the trocar assembly 270.

In one embodiment, and as shown, each of the first and second distal spacer members 256, 258 are secured about the inner and outer flexible band assemblies 210, 230 and to the outer sleeve 206 (FIG. 17) by a pair of screws 260 a, 260 b (FIG. 26). Alternatively, the first and second distal spacer members 256, 258 may be secured together in any suitable manner, including by welding, adhesives, and/or using mechanical fasteners. The first and second distal spacer members 256, 258 may be formed of metal or any other suitable material.

With reference now to FIGS. 27 and 28, the frame assembly 250 further includes a proximal seal member 262 and first and second distal seal members 264, 266. Each of the proximal seal member 252 and the first and second distal seal members 264, 266 include seals halves 262 a, 262 b, 264 a, 264 b, 266 a, 266 b, respectively. The proximal seal member 262 is received between the first and second proximal spacer members 252, 254 and the first and second distal spacer members 256, 258. The first half 264 a of the first distal seal member 264 is secured to the first half 266 a of the second distal seal member 266 and the second half 264 b of the first distal seal member 264 is secured to the second half 266 b of the second distal seal member 266. The proximal seal member 262 and the first and second distal seal members 264, 266 engage the outer sleeve 206 (FIG. 17), the inner and outer flexible bands 212, 214, 232, 234 of the respective inner and outer flexible band assemblies 210, 230 and the trocar assembly 270 (FIG. 28) in a sealing manner. In this manner, the proximal seal member 262 and the first and second distal seal members 264, 266 operate to provide a fluid tight seal between the distal end 204 and the proximal end 202 of the extension assembly 200.

With reference to FIGS. 29-32, the trocar assembly 270 of the extension assembly 200 includes an outer housing 272, a trocar member 274 slidably disposed within the tubular outer housing 272, and a drive screw 276 operably received within the trocar member 274 for axially moving the trocar member 274 relative to the tubular housing 272. In particular, the trocar member 274 includes a proximal end 274 a having an inner threaded portion 275 which engages a threaded distal portion 276 b of the drive screw 276. As the drive screw 276 is rotated within the trocar member 274, engagement of the inner threaded portion 275 of the trocar member 274 with the threaded distal portion 276 b of the drive screw 276 causes longitudinal movement of the trocar member 274 within the outer housing 272 of the trocar assembly 270. Rotation of the drive screw 276 in a first direction causes longitudinal advancement of the trocar member 274 and rotation of the drive screw 276 in a second direction causes longitudinal retraction of the trocar member 274. A distal end 274 b of the trocar member 274 is configured to selectively engage the anvil assembly 50 (FIG. 34).

A bearing assembly 278 is mounted to a proximal end 272 a of the outer housing 272 of the trocar assembly 270 for rotatably supporting a proximal end 276 a of the drive screw 276 relative to the outer housing 272 and the trocar member 274. The bearing assembly 278 includes a housing 278 a, proximal and distal spacers 278 b, proximal and distal retention clips 278 c, proximal and distal bearings 278 d, and a washer 278 e. As shown, the proximal end 276 a of the drive screw 276 includes a flange 276 c for connection with a link assembly 280.

The link assembly 280 operably connects the transfer assembly 130 (FIG. 6) of the adapter assembly 100 with the trocar assembly 270 (FIG. 30) of the extension assembly 200. More particularly, the link assembly 280 transfers rotational energy from the drive member 140 (FIG. 6) of the transfer assembly 130 of the adapter assembly 100 through the curved outer tube 206 (FIG. 17) of the extension assembly 200 to the flange 276 c (FIG. 29) on the proximal end 276 a of the drive screw 276 of the trocar assembly 270 of the extension assembly 200.

With reference to FIGS. 29A and 29B, the link assembly 280 includes a coupling member 282, a first drive shaft 284, and a second drive shaft 286. A proximal end 282 a of the coupling member 282 defines a recess 283 a for receiving a distal end 284 b of the first drive shaft 284. A distal end 282 b of the coupling member 282 defines a recess 283 a for operably receiving the flange 276 c on the proximal end 276 a of the drive screw 276. The coupling member 282 includes an annular flange 282 c for rotatably receiving the coupling member 282 between the first and second proximal spacer members 252, 254 (FIG. 32). The proximal and distal ends 284 a, 284 b of the first drive shaft 284 define oversized openings 285 a, 285 b, respectively, for receiving pins 288 a, 288 b, respectively. A distal end 286 b of the second drive shaft 286 defines a recess 287 for operably receiving the proximal end 284 a of the drive shaft 284. A proximal end 286 a of the drive shaft 286 includes a flange 286 c for operable receipt within the socket 145 of the drive member 140 of the drive transfer assembly 130 of the adapter assembly 100 (FIG. 12).

With particular reference to FIG. 29B, the proximal end 284 a of the first drive shaft 284 is operably received within the recess 285 in the distal end 286 of the second drive shaft 286. The distal end 284 b of the first drive shaft 284 is pivotally secured within the recess 283 a of the coupling member 282 by the pin 288 a received through the oversized opening 285 b in the distal end 284 b of the first drive shaft 284. The proximal end 284 a of the first drive shaft 284 is pivotally secured within the recess 287 in the distal end 286 b of the second drive shaft 286 by the pin 288 b received through the oversized opening 285 a in the proximal end 284 a of the first drive shaft 284. The recesses 283 a and 287 of the coupling member 282 and the second drive shaft 286, respectively, and the oversized openings 285 a, 285 b of the first drive shaft 284 are configured to permit pivoting of the second drive shaft 286 relative to the first drive shaft 284 and pivoting of the first drive shaft 284 relative to the coupling member 282 as each of the first and second drive shafts 284, 286, and the coupling member 282 are rotated about their respective longitudinal axes to transfer rotational force from the transfer assembly 130 (FIG. 6) of the adapter assembly 100 to the trocar assembly 270 (FIG. 30) of the extension assembly 200.

With reference now to FIGS. 32 and 33, the connector assembly 290 of the extension assembly 200 includes a tubular connector 292 attached to a distal end 206 a of the outer sleeve 206 and about distal ends of the inner and outer flexible assemblies 210, 230 (FIG. 26) and the trocar assembly 270. In particular, a proximal end 292 a of the tubular connector 292 is received within and securely attached to the distal end 206 b of the outer sleeve 206 by a retaining clip 294. An O-ring 296 forms a fluid tight seal between the tubular connector 292 of the connector assembly 290 and the outer sleeve 206. A distal end 292 b of the tubular connector 292 is configured to selectively engage a proximal end of the loading unit 40 (FIG. 34). The distal end 292 b of the tubular connector 292 engages the circular loading unit 40 with a snap-fit arrangement, bayonet coupling, or in another suitable manner.

With reference now to FIGS. 34 and 35, the extension assembly 200 is connected to the adapter assembly 100 by receiving the proximal end 202 (FIG. 17) of the extension assembly 200 within the distal end 104 of the adapter assembly 100. In particular, the first and second connection extensions 220, 222, 240, 242 of respective inner and outer flexible band assemblies 210, 230 are received within the sleeve 106 of the adapter assembly 100 such that tabs 178 of the pusher member 170 of the first pusher assembly 160 of the adapter assembly 100 are received within the openings 241, 243 of the respective first and second connection extensions 240, 242 of the outer flexible band assembly 230. In this manner, the outer flexible band assembly 230 is secured with the first pusher assembly 160. Additionally, the tabs 198 of the pusher member 190 of the second pusher assembly 180 of the adapter assembly 100 are received within the openings 221, 223 of the first and second connection extensions 221, 223 of the inner flexible band assembly 210 to secure the inner flexible band assembly 210 with the second pusher assembly 180.

As noted above, adapter assembly 100 may include a drive shaft 108 (FIG. 3) that extends from the distal end 104 of the adapter assembly 100. Prior to receipt of the proximal portion 202 of the extension assembly 200 within the distal end 104 of the extension assembly 100, the drive shaft 108 is removed from the adapter assembly 100. As the proximal portion 202 of the extension assembly 200 is received within the distal end 102 of the adapter assembly 100, the proximal end 286 a (FIG. 17) of the second drive shaft 286 (FIG. 17) is received within the socket 145 of the drive member 140 of the drive transfer assembly 130 of the extension assembly 100 (FIG. 12).

After the extension assembly 200 is operably engaged with the adapter assembly 100, and the adapter assembly 100 is operably engaged with the surgical device 10 (FIG. 1), the loading unit 40 (FIG. 34) of the end effector 30 (FIG. 34) may be attached to the connector assembly 290 of the extension assembly 200 and an anvil assembly 50 (FIG. 34) may be attached to the distal end 274 b of the trocar 274 of the extension assembly 200 in a conventional manner. During actuation of the loading unit 40 and the anvil assembly 50, longitudinal advancement of the pusher member 190 of the second pusher assembly 180 of the adapter assembly 100, as described above, and as indicated by arrows “C” in FIG. 35, causes longitudinal advancement of the outer flexible band assembly 230 of the extension assembly 200 and longitudinal advancement of the pusher member 170 of the first pusher assembly 160, as described above, and as indicated by arrows “D” in FIG. 35, causes longitudinal advancement of the inner flexible band assembly 210. Rotation of the drive shaft 108 in a first direction, as described above, and as indicated by arrow “E”, causes advancement of the trocar 274 of the extension assembly 200. Conversely, longitudinal retraction of the pusher member 190 causes longitudinal retraction of the outer flexible band assembly 230, longitudinal retraction of the pusher member 170 causes longitudinal retraction of the inner flexible band assembly 210, and rotation of the drive shaft 108 in a second direction causes retraction of the trocar 274 of the extension assembly 200.

In embodiments, the inner flexible band assembly 210 operably connects the second pusher assembly 180 of the adapter assembly 100 with a knife assembly (not show) of the loading unit 40 (FIG. 34) of the end effector 30 (FIG. 34) attached to the connection assembly 290 of the extension assembly 200. The outer flexible band assembly 230 operably connects the first pusher assembly 160 of the adapter assembly 100 with a staple driver assembly (not shown) of the loading unit 40. The trocar assembly 270 operably connects the drive transfer assembly 130 of the adapter assembly 100 to the anvil assembly 50 (FIG. 34) of the end effector 30 (FIG. 34). In this manner, operation of the second pusher assembly 160 causes longitudinal movement of the inner flexible band assembly 210 which causes longitudinal movement of the knife assembly, operation of the first pusher assembly 180 causes longitudinal movement of the outer flexible band assembly 230 which causes longitudinal movement of the staple driver assembly, and operation of the drive transfer assembly 130 causes longitudinal movement of the trocar 274 which causes longitudinal movement of the anvil assembly 50 relative to the loading unit 40.

By stacking the first and second pusher assemblies 160, 180 of the adapter assembly 100, as described, and positioning the drive shaft 108 of the transfer assembly 130 through the first and second pusher assemblies 160, 180, the adapter assembly 100 can perform three functions through an access port or other opening (not shown) having a small diameter, e.g., 21 mm. Similarly, by configuring the inner flexible band assembly 210 within the outer flexible band assembly 230 and receiving the trocar assembly 270 through the inner and outer flexible band assemblies 210, 230, the extension assembly 200 can perform three functions through an access port or other opening (not shown) having a small diameter, e.g., 21 mm.

With reference now to FIGS. 36-45, an adapter assembly according to another embodiment of the present disclosure is shown as adapter assembly 300. Adapter assembly 300 is substantially similar to adapter assembly 100 described hereinabove and will only be described as relates to the differences therebetween.

As will become apparent from the following description, the configuration of adapter assembly 300 permits rotation of a distal portion 304 of adapter assembly 300 about a longitudinal axis “x” (FIG. 37), relative to a proximal portion 302 of adapter assembly 300. In this manner, an end effector, e.g. the end effector 30 (FIG. 34) secured to the distal portion 304 of the adapter assembly 300 or an end effector secured to an extension assembly, e.g., the extension assembly 200 (FIG. 17) which is secured to the distal portion 304 of the adapter assembly 300 is rotatable about the longitudinal axis “x” independent of movement of the surgical device (not shown) to which the adapter assembly 300 is attached.

With particular reference to FIG. 37, the adapter assembly 300 includes a base 306 and a support structure 308 rotatable relative to the base 306 along the longitudinal axis “x” of the adapter assembly 300. A rotation handle 310 is rotatably secured to the base 306 and is fixedly secured to a proximal end of support structure 308. The rotation handle 310 permits longitudinal rotation of the distal portion 304 of the adapter assembly 300 relative to the proximal end 302 of the adapter assembly 300. A latch 312 (FIG. 36) is mounted to the rotation handle 310 and selectively secures the rotation handle 310 in a fixed longitudinal position.

With reference still to FIG. 37, the proximal portion 302 of the adapter assembly 300 includes a drive coupling assembly 320 and a drive transfer assembly 330 operably connected to the drive coupling assembly 320. The distal portion 304 of the adapter assembly 300 includes a first pusher assembly 340 operably connected to the drive transfer assembly 330, and a second pusher assembly 380 operably connected to the drive transfer assembly 330. The drive coupling assembly 320 and the drive transfer assembly 330 are mounted within the base 306 and remain rotationally fixed relative to the surgical device (not shown) to which the adapter assembly 300 is attached. The first pusher assembly 340 and the second pusher assembly 380 are mounted within the support structure 308 and are rotatable relative to the surgical device (not shown) to which the adapter assembly 300 is attached.

The drive coupling assembly 320 is configured to selectively secure adapter assembly 300 to a surgical device (not shown). For a detailed description of an exemplary surgical device and drive coupling assembly, please refer to commonly owned U.S. patent application Ser. No. 14/550,183, filed Nov. 21, 2014, the content of which is incorporated by reference herein in its entirety.

With continued reference to FIGS. 36 and 37, the rotation handle 310 of the adapter assembly 300 is rotatably secured to the base 306. The latch 312 is configured to lock the rotation handle 310 relative to the base 306. Proximal movement of the latch 312, as indicated by arrow “F” in FIG. 36, disengages the latch 312 from the base 306 to permit rotation of the rotation handle 310 relative to the base 306. For a detailed description of an exemplary rotation handle and latch mechanism, please refer to commonly owned U.S. Provisional Patent Application Ser. No. 62/066,518, the content of which is incorporated by reference herein in its entirety.

The support structure 308 is fixedly received about the first and second drive pusher assemblies 340, 380 and is rotatable relative to the base 306. As noted above, the rotation handle 310 is fixedly secured to the proximal end of the support structure 308 to facilitate rotation of the support structure 308 relative to the base 306. The support structure 308 is retained within the outer sleeve 305 of the adapter assembly 300 and is configured to maintain axial alignment of the first and second drive pusher assemblies 340, 380. For a detailed description of an exemplary support structure, please refer to commonly owned U.S. Provisional Patent Application Ser. No. 62/066,518, the content of which was previously incorporated by reference herein.

The drive transfer assembly 330, the first pusher assembly 340, and the second drive pusher assembly 380 of the adapter assembly 300 are substantially identical to the respective drive transfer assembly 130, first pusher assembly 160, and second drive pusher assembly 180 of the adapter assembly 100 described hereinabove, and therefore, will only be described as relates to the differences therebetween.

Briefly, the first pusher assembly 340 includes a planetary gear assembly 346 operably supported within a proximal housing section 342 and a screw member 348 operably connected to the planetary gear assembly 346 and rotatably supported within a distal housing section 344. The first pusher assembly 340 further includes a pusher member 350 operably connected to the screw member 348 and slidably disposed within the distal housing section 344.

With particular reference to FIGS. 38-41, the pusher member 350 includes a substantially cylindrical body 352 having a threaded proximal inner surface 352 a and opposed planar outer surfaces 354, 356. Retainers 358, 360 extend from the respective planar outer surfaces 354, 356. Each of the retainers 358, 360 includes a pair of elongate flanges 358 a, 358 b, 360 a, 360 b, respectively, and a connector 358 c, 360 c, respectively, connecting a proximal end of the elongate flanges 358 a, 358 b, 360 a, 360 b, respectively. Each of the retainers 358, 360 defines a longitudinal slot 359, 361, respectively, between respective elongate flanges 358 a, 358 b, 360 a, 360 b.

A pawl assembly 362, 364 is received within each of the longitudinal slots 359, 361, respectively. The pawl assemblies 362, 364 each include a plurality of pawl members 362 a-e, 364 a-e, respectively (collectively, pawls 366, 368, respectively), and pivot pins 363, 365. The pawls 366, 368 are secured within the respective longitudinal slots 359, 361 by the pivot pins 363, 365, respectively, received through openings 367, 369, respectively, formed in the respective distal ends 366 b, 368 b of the pawls 366, 368, respectively. The pawls 366, 368 each include a curved profile and are formed of a resilient material. Protrusions 370, 372 are formed on an outer curved surface of the respective pawls 366, 368 proximal to the distal ends 366 b, 368 b, respectively. The protrusions 370, 372 each include a flat proximal facing surface 370 a, 372 a, respectively, and a slanted or inclined distal facing surface 370 b, 372 b. As will be described in further detail below, the protrusions 370, 372 are configured to be received within openings 241, 243 (FIG. 43) of respective connector extensions 240, 242 (FIG. 43) of outer flexible band 230 (FIG. 42) of the extension assembly 200 (FIG. 42) to secure the outer flexible band 230 to the pusher member 350 of the first pusher assembly 340 when the extension assembly 200 is secured to the adapter assembly 300.

With particular reference to FIGS. 40 and 41, the pawls 366, 368 of the pawl assemblies 362, 364, respectively, are received within respective longitudinal slots 359, 361 of retainers 358, 360, respectively, with the respective distal ends 366 b, 368 b secured to retainers 358, 360, respectively, by pivot pins 363, 365, respectively. The proximal ends 366 a, 368 a of the pawls 366, 368, respectively, are received under the respective connectors 358 c, 360 c of the retainers 358, 360, respectively, and engage the planar surfaces 354, 356, respectively, of the cylindrical body 352 of the pusher member 350. The pawls 366, 368 are configured such that the protrusions 370, 372, respective, extend above the elongate flanges 358 a, 358 b, 360 a, 360 b, respectively, of the retainers 358, 360, respectively, when the respective pawls 366, 368 are in a first or initial position (FIG. 40).

With reference now to FIGS. 42 and 43, the curved profile of pawls 366, 368 is such that an inward force applied to the protrusions 370, 372, respectively, when the respective inclined distal surfaces 370 b, 372 b are engaged by connector extensions 240, 242, respectively, of outer flexible band 230 (FIG. 42) of the extension assembly 200 (FIG. 42) cause the pawls 366, 368 to flex inwardly. As the pawls 366, 368 flex inwardly the protrusions 370, 372, respectively, are positioned below the respective retainers 358, 360, thereby allowing connector extensions 240, 242 of outer flexible band 230 to pass over the respective retainers 358, 360. Once the openings 241, 243 of respective connector extensions 240, 242 align with the protrusions 370, 372, respectively, of the respective pawls 366, 368, the pawls 366, 368, respectively spring back to the initial position (FIG. 45), causing the protrusions 370, 372, respectively, to be received within the respective openings 241, 243 of the connector extensions 240, 242, respectively, such that the outer flexible band 230 (FIG. 42) of the extension assembly 200 (FIG. 42) is secured to the first pusher member 340.

Once the connector extensions 240, 242 of the outer flexible band 230 of the extension assembly 200 are received over the pawls 366, 368, respectively, and once the protrusions 370, 372 are received within respective openings 241, 243 of the respective connector extensions 240, 242, engagement of the connector extensions 240, 242 by the flat proximal surface 370 a, 372 a of the protrusions 370, 372, respectively, prevents the connector extensions 240, 242 from being disengaging from the first pusher assembly 340 during operation of the adapter assembly 300 and the extension assembly 200.

The adapter assembly 300 operates in a substantially similar manner to adapter assembly 100 described hereinabove. In addition, adapter assembly 300 is configured to permit rotation of an end effector, e.g., end effector 30 (FIG. 34) attached to adapter assembly 300 or attached to an extension assembly that is attached to adapter assembly 300 to be selectively rotated about longitudinal axis “x” (FIG. 36) during use.

Any of the components described herein may be fabricated from either metals, plastics, resins, composites or the like taking into consideration strength, durability, wearability, weight, resistance to corrosion, ease of manufacturing, cost of manufacturing, and the like.

Persons skilled in the art will understand that the devices and methods specifically described herein and illustrated in the accompanying drawings are non-limiting exemplary embodiments. It is envisioned that the elements and features illustrated or described in connection with one exemplary embodiment may be combined with the elements and features of another without departing from the scope of the present disclosure. As well, one skilled in the art will appreciate further features and advantages of the disclosure based on the above-described embodiments. Accordingly, the disclosure is not to be limited by what has been particularly shown and described, except as indicated by the appended claims. 

What is claimed is:
 1. A surgical assembly for operably connecting an end effector to an electrosurgical instrument, the surgical assembly comprising: an adapter assembly including, a connector assembly; a drive transfer assembly operably received through the connector assembly and including a first rotatable shaft; and a first pusher assembly operably connected to the first rotatable shaft for converting rotational motion from the first rotatable shaft to longitudinal movement to perform a first function, the first pusher assembly including a first pusher member, and first and second pawl assemblies; and an extension assembly operably connected to a distal end of the adapter assembly, the extension assembly including a flexible band assembly having first and second connector members, the first connector member being releasably connectable to the first pawl assembly of the first pusher assembly and the second connector member being releasably connectable to the second pawl assembly, wherein the first connector member is laterally spaced from the second connector member.
 2. The surgical assembly of claim 1, further including a second pusher assembly, and a second rotatable shaft operably connected to the second pusher assembly for converting rotational motion from the second rotatable shaft to longitudinal movement to perform a second function.
 3. The surgical assembly of claim 2, further including a drive member, and a third rotatable shaft operably connected to the drive member for transferring rotational motion from the third rotatable shaft to perform a third function.
 4. The surgical assembly of claim 1, wherein the first pawl assembly includes a first plurality of pawl members, and the second pawl assembly includes a second plurality of pawl members.
 5. The surgical assembly of claim 4, wherein each of the first and second connector members define an opening configured for selective receipt of a respective one of the first and second pawl assemblies.
 6. The surgical assembly of claim 5, wherein the first plurality of pawl members includes a first protrusion selectively receivable within the opening of the first connector member, and the second plurality of pawl members includes a second protrusion selectively receivable within the opening of the second connector member.
 7. The surgical assembly of claim 6, wherein each of the first and second protrusions includes a flat proximal facing surface and a slanted distal facing surface.
 8. The surgical assembly of claim 4, wherein the first and second plurality of pawl members are pivotally secured to the first pusher member.
 9. The surgical assembly of claim 4, wherein the first pusher member includes a first retainer for supporting the first plurality of pawl members, and a second retainer for supporting the second plurality of pawl members.
 10. The surgical assembly of claim 9, wherein the first and second retainers each define a longitudinal slot for receiving the respective first and second plurality of pawl members.
 11. The surgical assembly of claim 10, wherein the first plurality of pawl members are pivotally received within the longitudinal slot of the first retainer, and the second plurality of pawl members are pivotally received within the longitudinal slot of the second retainer.
 12. The surgical assembly of claim 11, wherein each of the first and second plurality of pawl members are configured to flex radially inward.
 13. The surgical assembly of claim 4, wherein the first and second plurality of pawl members each include a curved profile.
 14. The surgical assembly of claim 4, wherein the first and second plurality of pawl members are each formed of a flexible material.
 15. A surgical assembly for operably connecting an end effector to an electrosurgical instrument, the surgical assembly comprising: an adapter assembly including, a connector assembly; a drive transfer assembly operably received through the connector assembly and including a first rotatable shaft; and a first pusher assembly operably connected to the first rotatable shaft for converting rotational motion from the first rotatable shaft to longitudinal movement to perform a first function, the first pusher assembly including a first pusher member, and first and second pawl assemblies; and an extension assembly operably connected to a distal end of the adapter assembly, the extension assembly including a flexible band assembly releasably connectable to the first and second pawl assemblies of the first pusher assembly.
 16. The surgical assembly of claim 15, wherein the first pawl assembly includes a first plurality of pawl members, and the second pawl assembly includes a second plurality of pawl members.
 17. The surgical assembly of claim 16, wherein the flexible band assembly includes first and second connector members, each of the first and second connector members defining an opening configured for selective receipt of a respective one of the first and second pawl assemblies.
 18. The surgical assembly of claim 17, wherein the first plurality of pawl members includes a first protrusion selectively receivable within the opening of the first connector member, and the second plurality of pawl members includes a second protrusion selectively receivable within the opening of the second connector member. 